When was the last time they did any serious maintenance or referb? If it's fifteen years ago then the writing might be on the wall.
The planning dept. will only tell you what is already out there and they should 'consult' with residents as part of the initial steps of a 'regeneration' plan.
How can one find out if your council has plans to redevelop the estate you're on?
I work in E&C so am acutely aware of ayelsbury and heygate. #paranoia